.nav {
  height: px2rem(50px);
  border-bottom: 1px solid #b2b2b2;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 99;
  background-color: #fff;

  .title {
    font-size: px2rem(16px);
    color: #2f2f2f;
    text-align: center;
    line-height: px2rem(50px);
  }

  .back-icon {
    width: px2rem(27px);
    height: px2rem(27px);
    position: absolute;
    top: px2rem(7px);
    left: px2rem(10px);
  }
}